@article{ref1,
title="Problems of chronic carbon monoxide intoxication and studies on its emission in cities",
journal="Offentliche Gesundheitswesen",
year="1968",
author="Langmann, R. and Kettner, H.",
volume="30",
number="1",
pages="7-11",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0029-8573",
doi="",
url="http://dx.doi.org/"
}